I would make a bad robot

I was thinking about drinking green tea in lieu of a coffee the other day. I don't like the taste of green tea, but I was on a training course that had no availability of decent, free coffee and I have been trying to wean myself off coffee without much success lately.
I thought to myself, "I could make up a drink that's mostly coffee and a little of green tea. I could do this each day, gradually increasing the amount of green tea as I decreased the amount of coffee. Soon I would become used to the taste of green tea and would no longer be concerned with the lack of coffee."